Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc4a1131968eb9d…

MALICIOUS

PDF

45.6 KB Created: 2021-06-07 00:07:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3efcabea27dbeb57374c5997564fae38 SHA-1: b565bc081503d496289e9f279a3debcd2addc51f SHA-256: 5fc4a1131968eb9df6d30c1416c093ce6219cc6b891463ffdaa18e5e2aeb437b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and malicious infrastructure, disguised as free game hacks or generators. The primary link, https://netcdn.tw/app/431946152/free-cool-stuff-roblox-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to lead the user to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/free-cool-stuff-roblox-game-hack In PDF document text
    • https://www.croatia-flyfishing.com/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/www-rubux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/tiktok-free-like-followers_GM835599320.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D9 27112 bytes
SHA-256: 2223c2f3f63d43e12c55956fb2bfc8d5583025ce0b585d5aaa38a4573fe0b56e
font_01_sfnt_off00009021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9021 18192 bytes
SHA-256: 8b2341aa74898295f1c7c6d841d9049f192a7a72fb1884ff16c2290c76ec63a9

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